hello rayder, thanks for all the work..
did you try the zelda codes?, I enabled the max rupees and infinite rupees and nothing happens..
I tried "Infinite Rupees" and it worked for me. 9999...
Don't enable both the MAX and Infinite at the same time. Doing that could cause the cheats to fail, or even make the game crash. Choose one or the other.
Be real sparing with what cheats you select for any given run-through of the game, some cancel out others and some cancel out both.....sometimes both will yield the same result and still work. It's a crap shoot as to whether any particular combination of cheats is going to effect one another or not. It's all pretty much trial-and-error. Use only the ones that work for you.
I've found that cheats in the Eragon game don't work at all. Even the backlight codes fail to activate. I don't know what's up with that.